Siemens SINUMERIK 840D sl Series Diagnostics Manual page 322

Overview of Alarms
%2 = Axis name, spindle number
Definitions: After starting the reference point approach, the rising edge of the reduction cam must be
reached within the section defined in the MD 34030 REFP_MAX_CAM_DIST (phase 1 of
referencing). (This error occurs only with incremental encoders).
Reactions: - NC Start disable in this channel.
- Interface signals are set.
- Alarm display.
- NC Stop on alarm.
Remedy: Please inform the authorized personnel/service department. There are 3 possible causes
of error:
1. The value entered in MD 34030 REFP_MAX_CAM_DIST is too small. Determine the
maximum possible distance from the beginning of reference motion up to the reduction
cam and compare with the value in the MD: REFP_MAX_CAM_DIST, increase the value
in the MD if necessary.
2. The cam signal is not received by the PLC input module. Operate the reference point
switch by hand and check the input signal on the NC/PLC interface (route: switch!connec-
tor!cable! PLC input!user program).
3. The reference point switch is not operated by the cam. Check the vertical distance
between reduction cam and activating switch.
Program Con- Clear alarm with the RESET key. Restart part program
tinuation:
20001
Channel %1 axis %2 no cam signal present
Parameters: %1 = Channel number
%2 = Axis name, spindle number
Definitions: At the beginning of phase 2 of reference point approach, the signal from the reduction
cam is no longer available.
Phase 2 of reference point approach begins when the axis remains stationary after decel-
eration to the reduction cam. The axis then starts in the opposite direction in order to
select the next zero marker of the measuring system on leaving the reduction cam or
approaching it again (negative/positive edge).
Reactions: - NC Start disable in this channel.
- Interface signals are set.
- Alarm display.
- NC Stop on alarm.
Remedy: Please inform the authorized personnel/service department. Check whether the decelera-
tion path after the approach velocity is greater than the distance to reference point cam -
in which case the axis cannot stop until it is beyond the cam. Use longer cam or reduce
the approach velocity in machine data 34020 REFP_VELO_SEARCH_CAM.
When the axis has stopped at the cam, it must be checked whether the signal "DECEL-
ERATION REFERENCE POINT APPROACH" is still available at the interface to the NCK
(DB 31 - 48, DBX 12.7).
• Hardware: Wire break? Short circuit?
• Software: User program?
Program Con- Clear alarm with the RESET key. Restart part program
tinuation:
20002
Channel %1 axis %2 zero mark not found
Parameters: %1 = Channel number
%2 = Axis name, spindle number
Definitions: The zero marker of the incremental encoder is not within a defined section.
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SINUMERIK 840D sl/840D/840Di/810D Diagnostics Guide (DA), 08/2005 Edition
© Siemens AG, 2005. All rights reserved
08/2005